You mean purchasing a domain that's already owned? You'll find the majority of names that are for sale will be held by domain squatters and they'll want extortionate prices for them to be honest. You could always check on a domain name market site like Sedo, which is one of the biggest.

Yep, well basically Sedo allows buyers and sellers to complete domain transactions without ever knowing who the other party is, it also protects both by using Escrow for payments. All you can do when they have no set price is make an offer, I think the min. offer on Sedo is Â£60, and then they will most likely send a counter offer back. The other thing to know is that once the seller has received an offer they can either counter, accept or put the domain to a Sedo auction, where anyone can see the current bid and place their bids.

The other option is to try and contact the owner direct, if you check the WHOIS for the domain you can sometimes get their contact details (depends if they have paid for WHOIS protect to hide their info from the registrar). In the case of the domain you mentioned, it isn't hidden, and the details are listed as...

Ohh yeah, there's sooo many domains that have been registered with the intent to sell on, or people not developing on them for whatever reason or just simply forgetting they have them! It can be really frustrating! Good luck in tracking something good down.